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From Baltimore/Washington Airport (BWI)
- Begin at Baltimore-Washington International on ramp and go Northeast for about 100 feet
- Continue on MD-170,Aviation Blvd and go Northeast for about 200 feet
- Bear right on ramp at sign reading "I-195 West to Baltimore/Washington" and go Southeast for 0.2 miles
- Continue on I-195,Metropolitan Blvd and go Northwest for 3.8 miles
- Continue on ramp at sign reading "Exit 4B I-95 South to Washington" and go West for 0.3 miles
- Continue on I-95 and go Southwest for 19.6 miles 23.9
- Continue on ramp at sign reading "Exit 27-25 I-495 West to College Park/Silver Spring and US-1" and go Southwest for 0.4 miles
- Continue on ramp at sign reading "Exit 27 I-495 West to Silver Spring" and go Southwest for 0.6 miles
- Continue on I-495,I-495 Outerloop,Capital Beltway and go Southwest for 21.5 miles
- Continue on ramp at sign reading "Exit 9 I-66 West to Manassas/Front Royal" and go Southwest for 0.3 miles
- Merge onto I-66 West
- Take the VA-28 South exit towards Centreville, exit #53 for 0.4 miles
- Continue on Sully Rd for 0.7 miles
- Continue on Centreville Rd for 3.6 miles
- Turn Right on Rugby Road and go 0.1 miles
- RTI is located on the right at 8306 Rugby Road
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